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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aaca81d59c9fe91c64ee331e2c47c8fae9c27493da914a83cf596021686a071' 
  AND token = 'xmFOicJZ0cLVNawbzX1emRfHQkJwoxPjE1J8CxmCzTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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