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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b0af43b728b9b7aeba7b7941a3e44cf3c3aa00169f9877851bd1e2104e7366' 
  AND token = 'nyPANf4KS/44Pvr/5yqskBLUck6xMi3brU1B7kVlQrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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