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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb4a78fc4b5d358068088f233cefcc590c8bc15068f0eceb51b89b1fc264419' 
  AND token = 'b/bFdMQO7EaD8bT7ECcOfUtld3JcH4DKogrhN9zc0Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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