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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1307eb6c44b25faf3355524827bf6459855c3aa13d71d612ea1f3e5eaaffeea8' 
  AND token = 'wJLgywBJqZ0gRzhD0DjlvoyZ7XPtDafcinyXJe5lMZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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