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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0045fb5cad31464a4742215f6a0228bb7ee5b11e278563be7ddee7f9cdf138' 
  AND token = 'k+VUABm0vul50RffTN94oKvWIZZ4XQZ2qDi30+DLuj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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