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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f6912df42440d066387d1df8c20f6650ba47c83362200674cba33f145d1973' 
  AND token = 'beXVp02dt8gARnmRpmwa3ebtdJ/jarpPC4c8cdpOxXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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