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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baa3752061379ce1d927fb506346a93793ae465b5293ade307e373edae10758' 
  AND token = 'rHCC6P09gw5rTJBxK8DVvGw7BLdgAQNf8Qy3GMtT2WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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