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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9883676a33d7fb0a344c190604a59c46f7802dd907aa296cb920e0a08714533' 
  AND token = 'D5JBDuS/6KmoWrgOdLzETwtIBo4bKdHKPRL48KDWKQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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