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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d19914765f1389feed7e30e384696352c1e2b3fdebd84a879c4ac5b13dfdac0' 
  AND token = 'c42dAnvrIXKNpD7/QfYhFmnTykkNQCl6t3L5j28kwgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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