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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28b3792e568513ec9efa87b188d2bd71dc0e5dd4ed85c200b63e1afa6943e01' 
  AND token = 'albO6ZRUnh0rZALG3ihLVgu27MZGWymVRz2qLX3beZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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