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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a741e606ce3c6e0b3fabaf518473068540e53e0b3740106d3b852e3c75714177' 
  AND token = 'EWv1t4lucAXRYGs4ku86uBDXi3FFf5c386IAIKEHMI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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