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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a1330881d9a5de633d2f6bba79232d3b3561cc0b0d6f7aa52ffa18adc0bd06' 
  AND token = 'cRiqthfxa5IKZKudSq+ixBk9I0sjGcp9nF+YlRzpeGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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