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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0be7d94c6900b573a60cbcd4b32c09c689aa8f7e6c61b9e6f0cdfbd0e53619' 
  AND token = 'ZHWJIs+2/pqGu8uZDbwdQc7/SEnCttv0fD5dPhyJies=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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