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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8012d99db3f06299a571cafc97245bf752e163448f9cbcab82c180efb7d822' 
  AND token = 'L8HZVDOTwaMjKiVeef0hE44YK3ajTzhlB4D2+u1fpIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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