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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ec8c53c169dff75b6f0bde831499a971cc313b31cd642e488a28dc1f9aa1fa' 
  AND token = 'CRRYZvn+3kp/69kifiwg+4vEYiAHoBywyEPAVmibTqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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