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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b66c822a258355e5d5e3228792beb65790193dd7f8e93109742b04ac30ced4' 
  AND token = 't/3Bw7H6UV8uN0eISI4WBEX1I9xQoQj/jwcNh2lSEQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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