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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e923a872b2e09b026c5811487bbf153f8376eba62cb3773d95f347c3d75eaa8' 
  AND token = 'cXCcee6aEegZ6rUbmUfYSh38EQJt1dWPls0BP8cRf1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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