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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de05768ce28d93d94fcef9dfc6b1bba4ee14b4826a02bfd9789cdc548e988df' 
  AND token = 'Wky8vLrcXsDXX25YZsqpMDR+5ux8jEFhEEkF3JI/U7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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