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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18e81c958967c1167dbe0c7d5e2791444176ab5458b6e9c8ad480fff7ef5ed6' 
  AND token = 'L9ZM2dgnB1ONRilbJK/cyCiao5p1MYA3IGK5TRv+I+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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