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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bc5bfbe4b900bdb76aea7055ce80608f622be1fbaddc86cbb67b89c2fe76f0' 
  AND token = 'Ayek3scISQ78D3juNMI6EZbw28WMqpQ/6eNs+BbhUfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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