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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc227cda7fd67416cf462f5e4d8b5405b5b74e957015c2a4589aa6a0cd698e62' 
  AND token = 'lrn1awU/kQ7FJlsm84s9E4kdiAzTd3KiTRqOXDJ9hOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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