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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245d69ea168b73b172fb139a1264611f0e3bec471006b754fa14e8bf4bfebe93' 
  AND token = '+gqQwWLZccADGut3Lo9qeKGK4YR/iKw0NB4sRVZBwEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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