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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460f7d353104bfd6a641986daa9ed13df5f9f8ffc5fb452a34c053052032e15e' 
  AND token = 'GvZ4b+La20uHjrr8haLk4sayerudaiM2QPpv9xh3OxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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