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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4962b6018a08e2c3a0ca8fed8db959065f6ec5b5d5d3c3c5d8ae2700b54a77e8' 
  AND token = '0r4M7W9T/wukTq47MzTXgqSXLYFBMaD750yFqzOVcXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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