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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de7a6ccefe5202dc81d2839dfc1a478e4fb96d0e34f40a3e0fd4fab8836b1a8' 
  AND token = 'UNnzF7cJPFBdjOqwVGnSirDGt8FFYDKQiYsh2fT8Sbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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