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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be72d6bafa8fbfff631487d3a807c8a6d4fd0b30d0a158c88f14b3affde61801' 
  AND token = 'x/+ZIk0wkxEflKPneulAdssD6DMH8egOFgK01QveqTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}