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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e77f71915692570f20ed1d2fc9f8cb03f2559a47ef88fa3e6877b981a1f6e5' 
  AND token = 'AAarZe/da7ZImk+aUL+lz5pl9aS7V0T+BiKPUM+twFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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