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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbb1689a2037c21b04af171c4c0e5a1f143f3c559aafd7a8fdd4e53c874b528' 
  AND token = '4E+iUzkA2TCerU1G5u7y/pslUFadAaFZqGCwWBf1yq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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