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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e5b187134d2dbf135e5d76b1458aad07ec67ae857acd5a45c64fbc34555a38' 
  AND token = '720NDnqrcybBe2+9Uv/nUvp7vD0hZS3n4S3R8aczqGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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