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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008754dd178ef5e19274b5c8ba893d87703d4fe0ae337cc35f4bcbea87b2d206' 
  AND token = '+66P9riKSkAP/vAHOfWGKuPuNAOQZT/l4+ZueREAl2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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