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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee804e91e2731518be9c9a70dbd8f5339b8c28e7ab4503e7edbc4d94a9cddf5' 
  AND token = 'sAT7w7wymfDyHssI75trmKgmSbGbAdkObqMRboBZPRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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