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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0671d7b649699ccaf2d0ad2e091363ef289d4b748f5c7d6c8e50f5d3d40ec3fa' 
  AND token = 'mNe1pvAioSaS2qSppo4BpVHABcKv4TU0vP2tNZn15jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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